This is a radio thermostat with F type radio socket provide convenience to control heating system remotely for room temperature. Build-in sensors in your room wireless thermostat detects when the temperature falls to a chosen level and then feedback to the heating system to turn on. It's an easy use thermostats. Item No.: WT-02 Programmability: 7days programmable Mode: Heating and cooling mode (Default heating mode)  Backlight: White Material:  ABS+PC Radio Frequence: 433/868Mhz Socket type:  F Packing : Netural White Box, OEM acceptable Other function: Child lock, Open window detection, Frost protection, Temp. calibration  Optional: Opentherm protocol, WiFi optional, Zigbee optional Cetificate: CE, ROHS, UKCA, REACH, RED